(CNN)– This past weekend marked the worst for air traffic control staffing shortages since the government shutdown began.

That’s according to Federal Aviation Administration operations plans.

There were 98 “staffing trigger” reports at FAA facilities between Friday morning and Sunday night which means air traffic controllers had to alter operations to keep the airspace safe with fewer people working.

Alterations can include rerouting planes or delaying flights.

According to the FAA, a “surge” in controllers calling out on Halloween “strained” staffing at half of the 30 largest airports in the country.

See Full Page